Bug 20850 – Can't assign enum of Tuple

import std.typecons : Tuple, tuple; enum RC5Command: Tuple!(ubyte, ubyte) { Standby = RC5Command(0,0) } unittest { RC5Command rc5command = RC5Command.Standby; rc5command = RC5Command.Standby; // This line } The above code fails to compile with: Error: template std.typecons.Tuple!(ubyte, ubyte).Tuple.opAssign cannot deduce function from argument types !()(RC5Command), candidates are: /usr/lib/ldc/x86_64-linux-gnu/include/d/std/typecons.d(900,19): opAssign(R)(auto ref R rhs) with R = RC5Command must satisfy the following constraint: areCompatibleTuples!(typeof(this), R, "=") The root cause of this is areCompatibleTuples checks isTuple!Tup2, and should check isTuple!(OriginalType!Tup2) to account for enums.

@Biotronic created dlang/phobos pull request #7489 "Fix issue 20850 - Can't assign enum of Tuple" fixing this issue: - Fix issue 20850 - Can't assign enum of Tuple https://github.com/dlang/phobos/pull/7489

This is essentially due to https://issues.dlang.org/show_bug.cgi?id=20854. But we can workaround this problem in Phobos until a dmd fix is available.

dlang/phobos pull request #7489 "Fix issue 20850 - Can't assign enum of Tuple" was merged into master: - e6eaa8ea24f33b1aac7a5c0ccf41d5d01397fe39 by Biotronic: Fix issue 20850 - Can't assign enum of Tuple https://github.com/dlang/phobos/pull/7489